US and CA heater core differences?

missing linc said
When I was a kid I remember being told that convertibles had a bigger heater than other cars to keep the occupants warm in the winter. Made no sense to me, but it seemed like some people believed it

Might apply to some models but not A Bodies

I can say with the top up the inside of my 67 stays nice and warm.

Now with the top down and -10 deg F outside, that's another thing!

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